Glossary entry

French term or phrase:

dispersion

English translation:

dispersion

Added to glossary by kashew
Aug 24, 2010 19:22
13 yrs ago
1 viewer *
French term

dispersion

French to English Tech/Engineering Mechanics / Mech Engineering
Evening all. My problem is with the expression
Mesure du pas et de sa dispersion. It is about measuring screw thread and I assume pas is pitch. But what is dispersion. It feels like distribution or spread but I am quite sure there is technical term that escapes me. All answers gratefully received. Thanks
Proposed translations (English)
4 +4 dispersion
References
scatter
Change log

Sep 2, 2010 09:23: kashew Created KOG entry

Proposed translations

+4
8 mins
Selected

dispersion

In a numerically controlled machining tool, a tool path for machining, a rotational speed of a work and the like are input from cards, perforated tapes. magnetic tapes, etc. to a numerical control device in the form of coded numerical values, and machining is carried out according to output instructions from the numerical control device. While the numerically controlled machining tool, especially an NC-lath, is employed for threading in view of its performance, the so-called dispersion phenomena in which an effective radius or diameter of a finished screw thread is different from a desired dimension would arise due to thermal displacement of a machine, wear of a tool and the like.

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Note added at 1 heure (2010-08-24 20:43:16 GMT)
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From a patent application.
Peer comment(s):

agree Bourth (X) : Scatter? And yes, you have a brain, but not of that type.
28 mins
Thanks
agree FrenchPhD : yes
4 hrs
Thanks
agree chris collister : Yes, "dispersion" is measured by the standard deviation or its square, the variance.
16 hrs
Thanks
agree GeoS
2 days 22 hrs
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4 KudoZ points awarded for this answer.

Reference comments

12 hrs
Reference:

scatter

Screw pitch precision measurement using simple linear regression and image analysis

Screw pitch measurement technique in this paper is based on image ..... The scatter plot of the data in Table 1 with the best fitted line. ...
linkinghub.elsevier.com/retrieve/pii/S0096300305009847

Wear due to relative motion between component surfaces is one of the primary modes of failure for many engineered systems. Unfortunately, it is difficult to accurately predict component life due to wear as reported wear rates generally exhibit large SCATTER [ ... ] An example of a systematic error that could occur in wear testing is an error in the manufacturer’s reported value for the LEAD-SCREW PITCH. If an encoder is used to record lead-screw rotations and the number of rotations is used to determine sliding distance, an error in the lead-screw pitch would introduce a bias into the computed sliding distance
http://research.me.udel.edu/~dlburris/papers/JA1.pdf
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